NEGATIVE ELECTRODE FOR SECONDARY BATTERIES, AND SECONDARY BATTERY

• Main Authors: KUNISAWA MASATOSHI, YOKOUCHI HITOSHI, OHMORI MASAHIRO
• Format: Patent
• Language: English; Korean
• Published: 20.05.2015
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

본 발명은 티타늄 함유 산화물을 부극 활물질에 사용했을 경우에도, 도전 보조재, 등의 전기 용량에 기여하지 않는 재료를 대량으로 부극 활물질층에 첨가하지 않고, 내부 저항이나 임피던스가 작아 대전류로 급속한 충방전이 가능한 2차 전지를 제공하는 것을 목적으로 한다. 본 발명에 의하여, 금속박과, 상기 금속박의 편면 또는 양면에 형성된, 부극 활물질로서 티타늄 함유 산화물을 포함하는 부극 활물질층을 갖고, 상기 금속박과 부극 활물질층 사이에, 도전재를 포함하는 피막이 형성되어 있는 2차 전지용 부극이 제공된다. An object of the present invention is to provide a secondary battery capable of rapid charging and discharging at a high current, in which, even when a titanium-containing oxide is used as a negative electrode active material, the internal resistance and impedance of the secondary battery are low without adding a material, which does not contribute to electrical capacity, such as a conductive assistant to a negative electrode active material layer in a large amount. Provided is a negative electrode for a secondary battery including: metal foil; and a negative electrode active material layer that is formed on a single surface or both surfaces of the metal foil and includes a titanium-containing oxide as a negative electrode active material, in which a film containing a conductive material is formed between the metal foil and the negative electrode active material layer.